1660752749 has 4 divisors (see below), whose sum is σ = 1669183164. Its totient is φ = 1652322336.

The previous prime is 1660752719. The next prime is 1660752787. The reversal of 1660752749 is 9472570661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9472570661 = 193 ⋅49080677.

It can be written as a sum of positive squares in 2 ways, for example, as 751308100 + 909444649 = 27410^2 + 30157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660752749 - 2¹² = 1660748653 is a prime.

It is a super-2 number, since 2×1660752749² = 5516199386622114002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660752719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4214912 + ... + 4215305.

It is an arithmetic number, because the mean of its divisors is an integer number (417295791).

Almost surely, 2^1660752749 is an apocalyptic number.

It is an amenable number.

1660752749 is a deficient number, since it is larger than the sum of its proper divisors (8430415).

1660752749 is an equidigital number, since it uses as much as digits as its factorization.

1660752749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8430414.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 1660752749 is about 40752.3342767013. The cubic root of 1660752749 is about 1184.2270946052.

The spelling of 1660752749 in words is "one billion, six hundred sixty million, seven hundred fifty-two thousand, seven hundred forty-nine".